US1593406A - Loud speaker - Google Patents

Description

V. HIMMER LOUD SPEAKER July 20 1926.

Filed March 25,

1925 2 Sheets-Sheet 1 INVENTOR Vrrqus #071751? BY 1; a

July 26,1926 159mm V. HIMMER LOUD SPEAKER I Filed March 23, 1926 2 Si1aeis-511est 2 i il'l'llln INVENTOR l/ITHL /5 Hmy/ygrq BY .z X; ATTORNEYS Patented July 20, 1926.

VITALIS HIMMEB, 0F MOUNTAIN LAKES, NEW JERSEY.

' LOUD SPEAKER.

Application filed March 23, 1925. Serial No. 17,507.

This invention relates to improvements in acoustical devices, and has particular ret'erence to an instrument capable of reprpducing and amplifying sound vibrations transmitted by a record or equivalent element, or by electrical carrier waves It has heretofore been proposed to make diaphragms for sound reproducers of light vibratile material, such as paper, and to form a portion of the diaphragm into coneshape with the periphery thereof rigidly secured between clamping rings and the diaphragm. itself freely exposed to unconfined air. It

has been claimed for such construction that has'been found that, by making the dia phragm of conical formation throughout its entire area and providing the same with a support which permits of a free movement of the periphery thereof and which combines with said diaphragm to form a partially exposed resonance chamber so that the diaphragm will not vibrate entirely in free air, the resultant tones have a distinctive, highly pleasing and resonant quality which is lacking when the surfaces of thediaphragm are entirely exposed to an unconfined air space. i

Furthermore, it has been discovered that. a'reproducer constructed as above set forth willmore accurately register sound vibrations of all audible frequencies when the periphery of the diaphragm, which is so cured to its support by an adhesive, is also fastened thereto with a binding element of flexible material. During the drying process following the application of the ad hesive to the diaphragm and its support and the binding thereof with said element, there will be an uneven shrinluing of the periphery of the diaphragnrwhich will result in more or less strain being applied to different portions of said periphery by said binding element. Therefore, when the diaphragm is vibrated the portions under greater strain will accurately produce vibrations of a higher frequency, while those under a lesser strain will faithfully register vibrations of a lower frequency.

'It'is further proposed to reinforce the diaphragm about its apex so as to impart a graduated rigidity to the diaphragm for a considerable area about its apex, which rigidity will be decreased as the periphery of the diaphragm is approached.

The inventive idea involved is capable of receiving a variety of mechanical expressions some of which, for the purpose of illustration, are shown in the accompanying drawings; but it is to be expressly understood that said drawings are used merely for the purpose of illustrating the invention as a whole'and not to define the limits thereof, reference being had to the appended claims for this purpose In the drawings Figure 1 is a side elevation, partly broken away and shown in section, of an acoustical device constructed in accordance with the invention; I

Figure 2 is a rear elevation thereof, partly broken away; it

Figure 3 is an enlarged fragmentary sectional view showing the construction of the apex of the diaphragm;

Figure t is a similar view showing the construction at the periphery of the diaphragm;

Figure 5 is an end elevation of a sh different form of the invention;

Figures 6 and 7 are views similar to Fig ure 4:, also showing slightly different forms of the invention;

Figure 8 is a side elevation illustrating. the application and use of the invention in connection with a phonograph record having a groove of the vertically undulating type; and I 1 Figure 9 is a similar view showing the application of the invention to a phonograph record having a groove of the laterall y undulating type.

The device of the present invention is primarily designed as a so-cailed loud speaker for radio receiving paratus, but

its construction also permits'of the same berality radiating arms son oi this construction whenvibrations are impressed, upon the diaphragm at its apex the reinforcement of the diaphragm by the disks 19, 20 andill will minimize any tendency of a wave motion being imparted to the diaphragm as distinguishedfrom a bodily movement of the diaphragm which actu ally occurs with the present construction. This bodily movement or vibration of the diaphragm is partly due to the fact that the periphery thereof is flexibly sup orted by the element 12 and not rigidly Xed as is customary with sound reproducers of known construction.

In order that vibrations might be'imparted to the apex of the diaphragm 13 a vibratory netic. device,

unit in the form of an elect-ro-inagopening in the supporting ring '10 and can ried by a cross'piece 23, the ends O fWl11Cl1 are detachably secured to said rlng in order that the unit may be removed whenever de sired. The unit 22, which is an electrically modulated vibratory mechanism and is only conventionally illustrated in the present case, it being understood that any other suitable mechanism may be employed to impart vibrations to the diaphragm.- This unit further consistso'l a rod 24: one end of Which is connected to the armature of the electromagnet contained in the unit 22 and the other end of? which is extended through a terminal member 25 adjustable longitudinall'y of said rod and secured thereto by a siiitable screw 26. The member 25 is provided with a reduced screw threaded shank 27 which projects into the opening 18 in the apex of the diaphragm and has mounted thereon a nut 28 which'engages the disk 20 so that the various disks 19, 20 and 21 will be clamped between the head of the member 25 and said nut 28.

A slightly ditlerent form of construction is shown in Figure 5 wherein the flexible support 29 instead of being formed like the support l2 of Figure 1 is cut to provide a spider-like construction consisting of a plu- 30, the outer ends of which are secured to the diaphragm 13 in the same way that the outer periphery of the support 12 is secured thereto. By this construction the amount of exposure of the inner surface of the diaphragm to unconfined air is increased and the nature of the resonance chamber formed between the flexible support and the diaphragm and the result obtained therefrom would be changed.

Figure 8 illustrates the application of the inventive idea to a sound reproducer which may be employed in connection with talk ing machine records having vertically undulating grooves. In this construction the sound reproducer, which is of the same construction as shown in Figure l with-the .arm 31 pivoted at one end to a standard 32 and secured at its other end to the rigid ring 10. In this instance the apex of the diaphragm may receive and'have secured therein a jewel ball or sapphire stylus 33 which is engageable in the grooves of a record 34.

lVhen used with records having laterally undulating groovesthe reproducer is supported in a vertical position by an arm 35 pivotally connected to a standard 36. The arm 35 supports a stylus bar 37 to which is connected the usual stylus 38 and intermediate' the ends of said stylus bar the same carries] a; rod 39 which extends into the generally indlcated by the numeral 22, is centrally disposed in the "2D reproducer and has its end connected to the apex of the diaphragm 13, preferably in thesame manner that the rod 24 is mounted.', Thus the. vibrations imparted to the stylus bar/3'? will be transmitted to the apex extending about the periphery 0 said dia-' phragm.

2. In anacoustical device, a conical diaphragm, a flexible support for said diaphragm secured. thereto at a point inwardly of the periphery thereof, a ri cl support for said flexible support, and a indin element extending about the eriphery 0 said diaphragm and securing tie same and said support together.

3. In an acoustical device, a conical diaphragm, means for impartin a graduated rigidity thereto at its apex, a exiblefrustd conical support having its outer edge secured to saiddiaphragm at a distance from its periphery, and a flexible binding extending about the periphery. of said diaphragm and overlapping the outer edge of said flexible support.

4. In an acoustical device, a conical diaphragm, means for imparting a graduated rigidity thereto at its apema flexible support secured to said diaphragm, and a binding element extending about the periphery of said diaphragm and securing the same and said flexible support together. 7

5. In an acoustical device, a conical diaphragm, a non-rigid support for the periphcry thereof, reintorcingdisksarranged on opposite sides of the diaphragm atits apex,

and another reinforcing disk of greaterto the DISCLAIMER.

1,593,406. Vitahs Himmer, hlountain Lakes, N. J. LOUD SPEAKER. Patent date July 20, 1926. Disclaimer filed July 10, 1929, by the patentee.

Hereby enters this disclaimer to claim 8 of said Letters Patent.

8. In an acoustical device, a diaphragm, a flexible support secured thereto adjacent its periphery and having a central opening, the diameter of which is less than the Width of the support from its periphery to the edge of said opening, said support combining with the diaphragm to form a resonance chamber therebetween, a ring secured to the flexible support adjacent to and surrounding the opening therein and forming an entrance to said resonance chamber, and means carried by said ring in the entrance formed thereby and connected to said diaphragm for Vibrating the same.

[Ofiicial Gazette of July 30, 1929.]

DISCLAIMER.

1,593,406. Vitalis Himmer, Mountain Lakes, N. J. LOUD SPEAKER. Patent date July 20, 1926. Disclaimer filed July 10, 1929, by the patentee.

Hereby enters this disclaimer to claim 8 of said Letters Patent.

8. In an acoustical device, a diaphragm, a flexible support secured thereto adj acent its periphery and having a central opening, the diameter of which is less than the Width of the support from its periphery to the edge of said opening, said support combining with the diaphragm to form a resonance chamber therebetween, a ring secured to the flexible support adjacent to and surrounding the opening therein and forming an entrance to said resonance chamber, and means carried by said ring in the entrance formed thereby and connected to said diaphragm for vibrating the same.

[Ofiicial Gazette of J My 30, 1929.]

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